add object at specific location with python?
The tooltip of the Add > Mesh > Plane menu path shows this information, press Ctrl+C to copy it to clipboard.

Tooltip



All of these menu items trigger operators and take several optional arguments, location=(x,y,z) included. The same applies to the other items in the Curve, Surface Metaball etc., menus.

Docs

The total list can be found in several locations, in the docs 

Blender's Python Console

use the auto complete feature (ctrl+space) in the Blender python console after typing bpy.ops.mesh.primitive_



The arguments to the bpy.ops.* can be found doing auto completion too



Info Panel

You can see the history of most of the code which has been triggered in the UI, in the Info panel if you drag it down